Poor customer service experience

MTN's customer service is poor. I made a payment on the 20 March 2020 (as arranged with one of the consultants) well guess what, till today the payment is not allocated. I've sent my proof of payment 4 times already, but still they went an suspended my line and now threatening to hand me over. I tried several times to establish contact with MTN, 135 goes to their automated answering machine (after holding for 30 minutes) I've sent about 4-5 emails still no assistance, I even sent DM's on Twitter well dololo response. Honestly this is unacceptable and unprofessional. MTN can you please treat your customers fairly, I mean why would you hand me over for the payment I made long time ago and even sent proof of payment? What is your allocations department doing?